United States: Arkansas, Kansas, Missouri, Nebraska, North Dakota, Oklahoma, South Dakota, & Texas

Canada: Manitoba (Province), Nunavut (Territory)

United Mexican States: Aguascalientes, Coahuila, Colima, Guanajuato, Guerrero, Hidalgo, Jalisco, Mexico, Michoacán, Morelos, Nuevo Leon, Puebla, Queretaro, San Luis Potosi, Tamaulipas, Tlaxcala, Veracruz, Zacatecas; Mexico City (Federal District)

See below for links to individual State Chapter organizations: